Overview
The Allen-Bradley 1771-OFE2 is an intelligent analog output module that converts processor-supplied binary or BCD data into proportional 4-20mA current signals. The module controls four differential voltage or current outputs, making it essential for applications requiring precise analog control in industrial automation systems. This Series B module includes the 1771-WC wiring swing arm for field installation.
Key Features
- Four individually isolated output channels delivering 4-20 mA current output
- Factory-set 4 to 20 mA output range for the 1771-OFE2 version
- 12-bit binary digital resolution for accurate signal conversion
- Selectable data format using binary or four-digit BCD values
- Receives processor data through block transfer write instructions for digital-to-analog conversion, converting binary or BCD values into proportional analog output signals
- Single I/O chassis slot requirement with low power consumption
Technical Specifications
- Output: 4-20 mA current (individually isolated, 1000V isolation)
- Digital Resolution: 12-bit binary
- Number of Channels: 4 isolated outputs
- Power Dissipation: 7.9 watts
- Backplane Power Draw: 1.50 A
- Operating Temperature Range: 0–60°C (32–140°F)
- Module Slot Width: Single slot
- Data Formats Supported: Binary, four-digit BCD
- Wiring Arm: 1771-WC included
- Series: B (current version, pre-configured)
- Weight: 2.11 lb
- Certifications: UL, CSA, CE, C-TICK, MARINE
Typical Applications
- Drives analog devices such as valve positioners, motor speed controllers, signal converters, and recorders
- Process control systems requiring proportional current outputs
- Industrial motion and servo control loops
- Actuator positioning and flow regulation
- Data acquisition and signal scaling in manufacturing environments
- Installs in 1771 I/O chassis used with programmable controllers that support block transfer capability
Compatibility & Replacements
Compatible With
- Allen-Bradley Universal I/O Chassis 1771-A1B, 1771-A2B, 1771-A3B, 1771-A4B
- PLC-5 programmable controllers with block transfer instruction capability
- Legacy Allen-Bradley 1771 I/O systems
- Control systems supporting binary and BCD data transfer protocols
Replaces / Drop-In Replacement For
- 1771-OFE2 Series A (same electrical function, Series B includes pre-configured jumpers)
- Other 1771-series 4-channel analog current output modules in identical chassis slots
Works With
- Allen-Bradley PLC-5 programming platforms
- Legacy automation control systems with 1771 I/O architecture
- Block transfer read/write communication protocols
- 1771-WC field wiring arms and terminal assemblies
- Standard industrial 4-20mA analog signal ecosystems
